|This is a hilarious action-packed Hong Kong martial arts comedy. During one of the many fight scenes, we see an incompetent assasin named Sing hiding behind some wire cages full of snakes in a hallway. He tells his accomplice, Bone, that he's going to kill Landlady, a very loud, powerful woman, with a cigarette in her mouth and curlers in her hair. He tries to throw a knife at her, but the knife bounces off a wall and returns to stab him in the shoulder. Wounded, he encourages Bone to throw a knife at her, but Bone looses control of it and the knife stabs Sing in his other shoulder. Sing tells him to get a little bit closer and take better aim, but Bone stabs Sing as he winds up to throw, and when he throws the knife, the blade stays in Sing's arm and he only throws the handle, which hits Landlady in the face. After she sees him, Bone picks up a wire cage full of snakes to throw at her but it opens behind him and the snakes pour down onto Sing. Sing is terrified, but Bone tells him that if he whistles, the snakes won't bite. Sing is skeptical, but he decides to try, and just as he starts whistling, two cobras bite him on the mouth. Sing yanks the snakes off of his face and Sing and Bone split up and run away, with Landlady chasing after Sing and the two knives still sticking out of his shoulders.
This is one of the more unusual uses of snakes I've seen in a movie because the snakes and their venomous bites are used for comedy as well as for a little bit of tension. It's hard to tell because it's so fast, but I think the snakes that we see dumped on Sing are either CGI or real non-venomous snakes. The snakes that bite him are obviously special effects snakes, probably CGI. We see a couple of cutaway shots of what look like live cobras.
Watch the snake scene on YouTube.